Glen has a job selling magazine subscriptions by phone. He makes a base salary of $12.60 per hour plus a 5% commission on all sales. Last week, Glen worked 35 hours and sold 5230 worth of subscriptions What was his gross pay for the week?

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?